Justin Holder
Member
- Joined
- Apr 24, 2010
- Messages
- 484
I'm new to reloading and need help understanding something.
While setting up an RCBS FL sizing die in .223rem. for a CZ bolt action I found something odd.
When comparing factory unfired ammo headspace to once fired case headspace using a Hornady Headspace Comparator, the once fired cases headspace is .003 shorter than unfired factory ammo. All cases have been fire formed in my gun.
When I set the sizer die to full length resize the headspace measurement stays the same but OAL stretches out by .005
What is going on? I was under the impression that factory ammo was already at a minimal size and headspace would stretch upon firing, not get shorter.
While setting up an RCBS FL sizing die in .223rem. for a CZ bolt action I found something odd.
When comparing factory unfired ammo headspace to once fired case headspace using a Hornady Headspace Comparator, the once fired cases headspace is .003 shorter than unfired factory ammo. All cases have been fire formed in my gun.
When I set the sizer die to full length resize the headspace measurement stays the same but OAL stretches out by .005
What is going on? I was under the impression that factory ammo was already at a minimal size and headspace would stretch upon firing, not get shorter.